Look at the following figures and write the name of the vertex of the angle :

Look at the following figure and name the angle marked by digit $2$ by using three letters.

If the required answer is of the form $\angle \mathrm{WO}\square$, then what letter should come in place of $\square$?

Look at the below figure and name the angle marked by digit $6$ (without the $\angle$ symbol) by using three letters.$\left(\mathrm{ROS}/\mathrm{SOT}/\mathrm{TOU}/\mathrm{POQ}\right)$

Look at the following figure and name the angle marked by digit $7$ by using three letters :

Write the correct answer from: $\mathrm{POW}/\mathrm{ROQ}/\mathrm{UOV}/\mathrm{SOT}$ (without the $\angle$ sign).